export function observeProps(props) {
	if (!props) {
		return;
	}
	Object.keys(props).forEach(key => {
		let prop = props[key];
		if (prop === null || !('type' in prop)) {
			prop = { type: prop };
		}
		let { observer } = prop;
		prop.observer = function (...args) {
			if (observer) {
				if (typeof observer === 'string') {
					observer = this[observer];
				}
				observer.apply(this, args);
			}
			this.set();
		};
		props[key] = prop;
	});
}
